Power tiller



FIG. 1 is a right side view of a power tiller showing our new design;

FIG. 2 is a bottom view;

FIG. 3 is a front view;

FIG. 4 is a top plan view;

FIG. 5 is a left side view; and,

FIG. 6 is a rear view. 

The ornamental design for a power tiller, as shown and described. 